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Method for improving Bi-system high temperature superconducting wire internal interface conditions

A high-temperature superconducting and wire technology, which is applied in the direction of furnace types, furnaces, heat treatment furnaces, etc., can solve the problems of wire electrical performance degradation and other problems

Active Publication Date: 2009-11-18
INNOVA SUPERCONDUCTOR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mechanical properties of the material have been improved by the addition of alloying elements in terms of the size of the cracks, the electrical properties of the wire have declined.
Therefore, it is still difficult to solve the above problems well

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put the superconducting rod pressed by the cold isostatic pressing method into a pure silver sleeve, and draw it into a single-core superconducting wire after cold drawing. Hours annealing the wire. According to the relevant requirements, the single-core wire is cut into 37 or 61 segments and put into a silver alloy tube to become a multi-core wire, and then the multi-core wire is drawn. The wire is pretreated by keeping the temperature for 1 hour. Then, in an atmosphere of nitrogen-hydrogen gas (hydrogen < 3%), the pretreated multi-core wire rod is subjected to aging treatment for 24 hours, and then rolled. After wire rolling, a pretreatment was carried out at a temperature of 480 °C for 1.5 hours.

[0027] After the above-mentioned annealing process is completed, follow-up HT1, DR1, HT2, and PA sintering heat treatment processes are completed according to the standard process to obtain a high-performance Bi-based superconducting wire.

Embodiment 2

[0029] Put the superconducting rod pressed by the cold isostatic pressing method into a pure silver sleeve, draw it into a single-core superconducting wire after cold drawing, and keep the temperature at 280°C for 8 Hours annealing the wire. According to the relevant requirements, the single-core wire is cut into 37 or 61 segments and put into a silver alloy tube to become a multi-core wire, and then the multi-core wire is drawn. The wire is pretreated by holding the temperature for 3 hours. Then, under a nitrogen (pure nitrogen) atmosphere, the pretreated multi-core wire rod was subjected to an aging treatment for 12 hours, and then rolled. After wire rolling, a pretreatment was carried out at a temperature of 430 °C for 4 hours.

[0030] After the above-mentioned annealing process is completed, follow-up HT1, DR1, HT2, and PA sintering heat treatment processes are completed according to the standard process to obtain a high-performance Bi-based superconducting wire.

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PUM

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Abstract

The invention relates to a method for improving Bi-system high temperature superconducting wire internal interface conditions, which removes the internal stress remaining in the wire in advance by the method of different processes of annealing treatment on the wire after wire single-filament drawing, multiple filaments drawing and blooming, and before the first sintering and heat treatment, and the method of increasing pretreatment techniques and the like; thus lowering the influence of the internal stress on the silver-super interface, decreasing the occurrence of cracks and improving superconductive wire performance. The superconductive wire prepared in the invention is further characterized in that the silver-super interface conditions are improved dramatically, the length of the inner cracks is less than 5mum, the grain orientation angular difference of Bi-2223 phase in the belt materials is less than 10 degrees, and the inner residue stress of the belt materials (multiple filaments) before the first heat treatment is less than 0.5MPa.

Description

technical field [0001] The invention relates to a Bi-based high-temperature superconducting wire, in particular to a method capable of improving the internal interface conditions of a Bi-based high-temperature superconducting wire. Background technique [0002] With the increasing application of high-temperature superconducting technology, the market demand for high-temperature superconducting wires will increase. At present, the Bi-based high-temperature superconducting wire is the only high-temperature superconducting wire that can be mass-produced. The superconducting rod pressed by cold isostatic pressing is packed into a pure silver sleeve, and then cut according to relevant requirements after cold drawing. Set into a multi-section into the silver alloy tube for cold drawing again. Then the drawn multi-core wire is rolled into a superconducting strip according to the size requirement of the superconducting strip. After the sintering heat treatment process, the desired...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52C21D1/26C22F1/00
Inventor 刘睿
Owner INNOVA SUPERCONDUCTOR TECH
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